Great! Very slim and comfortable to wear. The cutting guide lines are on the underside of the sole but of course they are just guidelines and your feet might be differently shaped. Easy to trim down with sharp scissors.
I should note that although they are very, very slim (especially compared to similar products), they do not fit in all my shoes (but fit most, especially the sports ones) but that's not a problem of the product. If these insoles don't fit that you won't have much like with competitors.
I personally like the rigidity of the insoles. Would purchase again.